已知函数
有两个零点,则实数a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e65ae79f21945aa18419e8890397970.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2022-04-29 20:33:14
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单选题
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(0.4)
名校
【推荐1】已知函数
,
,若
有6个零点,则a的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e0d2a98a3533caa18e58e9391f2b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb1e7475dd989f4a692bfc8b206b107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfc6f997f5465c88d68dde7fd874fe4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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|
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【推荐2】已知
,若
是函数
的一个零点,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab652070827c690e42076a281c591f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08649488c4b6e75ded28491787ef7558.png)
A.0 | B.![]() |
C.1 | D.![]() |
您最近一年使用:0次
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解题方法
【推荐1】已知函数
,设函数
,则函数
有6个零点的充要条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66229c78b5ea53fb93a27a3ac2086bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc03310fc91e68b9529fce0ad511be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be55c8f2760d6db125f46691a3de48.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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较难
(0.4)
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解题方法
【推荐2】已知函数
,若
存在四个互不相等的实数根,则实数
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e58c958aa5f66a2fe974e6517debd0f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804c9cadb1f88ae4d408c94294ba5902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知等差数列
的前
项和为
,且
.若存在实数
,
,使得
,且
,当
时,
取得最大值,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8209efd1f91f2ca5dab84c068cf5f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8792eaab0b6464e5d07436c64aa751a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b8d6d6a737c00b19aaa3008adfede6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef7ca2b3e8061384501f668e59696a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba28541348b873e9f826558db1c51e3.png)
A.12或13 | B.11或12 |
C.10或11 | D.9或10 |
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解题方法
【推荐2】已知函数
在区间
上单调递增,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c337138a82469f2553cebdb38c0c396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30dea7ffafd35dc04afbebf426e45ee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】已知
(
),下列结论正确的是( )
①当
时,
恒成立;②当
时,
的零点为
且
;③当
时,
是
的极值点;④若
有三个零点,则实数k的取值范围为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f83aa66326e03b2f7a93369e43bec9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c36b234ba460321e811de1729eadd4b6.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5813437adbc6b496967b1ce2a0aee48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482d52322a8d224edda82819cd388565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada766daf3d72afc5668e81d9d79efb1.png)
A.①②④ | B.①③ | C.②③④ | D.②④ |
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【推荐2】已知函数
有两个不同的零点
,符号
表示不超过
的最大整数,如
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbeeb712247ed1c0596d2908c6046bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f161c2a3717f1b6c62d0d7dae0b606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e43042dc14dfc22d2f7a9de0f1d0531.png)
A.![]() ![]() |
B.![]() |
C.![]() |
D.若![]() ![]() ![]() |
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